Undorosaurus
| Undorosaurus Temporal range: Late Jurassic | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Order: | †Ichthyosauria |
| Family: | †Ophthalmosauridae |
| Subfamily: | †Platypterygiinae |
| Genus: | †Undorosaurus Efimov, 1999 |
| Species: | † U. gorodischensis |
| Binomial name | |
| Undorosaurus gorodischensis Efimov, 1999 | |
| Synonyms | |
|
Ophthalmosaurus gorodischensis Maisch & Matzke, 2000 | |
Undorosaurus is an extinct genus of ophthalmosaurid ichthyosaur known from Ul'yanovsk Province of western Russia.[1]
Description
Undorosaurus is known from the holotype UPM EP-II-20 (527), a partial three-dimensionally preserved skeleton which preserved partial skull. It was collected near the Volga river at Gorodische from the Epivirgatites nikitini ammonoid zone, dating to the Late Jurassic.[1]
Maisch and Matzke (2000) regarded Undorosaurus to be a species of Ophthalmosaurus.[2] However, Storrs et al. 2000 rejected this synonymy based on the tooth morphology of the specimen.[3] Chris McGowan and Ryosuke Motani (2003) pointed out two noteworthy differences to Ophthalmosaurus, an incompletely fused ischiopubis and a remarkably strong dentition, and considered Undorosaurus to be a valid genus of ophthalmosaurid.[4] Undorosaurus's validity is now accepted by most authors, even by Maisch (2010) who originally proposed the synonymy.[5][6][7]
Etymology
Undorosaurus was named by Vladimir M. Efimov in 1999 and the type species is Undorosaurus gorodischensis. The specific name is named after Gorodische, the type locality of this taxon.[1]
References
- ↑ 1.0 1.1 1.2 Vladimir M. Efimov (1999). "A new family of Ichthyosaurs, the Undorosauridae fam. nov. from the Volgian stage of the European part of Russia". Paleontological Journal 33 (2): 174–181.
- ↑ Michael W. Maisch and Andreas T. Matzke (2000). "The Ichthyosauria". Stuttgarter Beiträge zur Naturkunde: Serie B 298: 1–159.
- ↑ Storrs, Glenn W.; Vladimir M. Efimov and Maxim S. Arkhangelsky (2000). "Mesozoic marine reptiles of Russia and other former Soviet republics". In Benton, M.J.; Shishkin, M.A.; and Unwin, D.M. The Age of Dinosaurs in Russia and Mongolia. Cambridge: Cambridge University Press. pp. 140–159. ISBN 0-521-54582-X, 9780521545822 Check
|isbn=value (help). - ↑ McGowan C, Motani R. 2003. Ichthyopterygia. – In: Sues, H.-D. (ed.): Handbook of Paleoherpetology, Part 8, Verlag Dr. Friedrich Pfeil, 175 pp., 101 figs., 19 plts; München
- ↑ Michael W. Maisch (2010). "Phylogeny, systematics, and origin of the Ichthyosauria – the state of the art". Palaeodiversity 3: 151–214.
- ↑ Fischer, V.; A. Clement, M. Guiomar and P. Godefroit (2011). "The first definite record of a Valanginian ichthyosaur and its implications on the evolution of post-Liassic Ichthyosauria". Cretaceous Research 32 (2): 155–163. doi:10.1016/j.cretres.2010.11.005.
- ↑ Fischer, V.; Masure, E.; Arkhangelsky, M.S.; and Godefroit, P. (2011). "A new Barremian (Early Cretaceous) ichthyosaur from western Russia". Journal of Vertebrate Paleontology 31 (5): 1010–1025. doi:10.1080/02724634.2011.595464.